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Ch7sec1

Earth layers

TermDefinition
Crust Earth's solid, rocky surface containing the continents and ocean floor.
Original Horizontally The idea that many kinds of rocks form flat , horizontal layers.
Continental drift The idea that a supercontinent split apart into pieces, the continents, which drifted in time to their present locations.
Sea-floor spreading The idea that new crust is forming at ridges in the sea floor, spreading apart the crust on either side of the ridges.
Magma Hot, molten rock below Earth's surface.
Plate Tectonics The idea that Earth's surface is broken into plates that slide slowly across the mantle.
mantle The layer beneath Earth's crust.
Subduction the sliding of a denser ocean plate under another plate when they collide.
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